Let's begin this example by adding a DoorHuge prefab to our level. In case we place the door without any pressure pad, this door will block the player as if it was a wall, not letting the character cross to the other side. Here's the graphic representation:
So, in order to activate the door and open it, we will have to add a pressure pad to our level. We need to consider that the path to this pad needs to be accessible for the character, as if not, the door will never open, because the player won't be able to step on the pad:
If we just add the pad, we won't be ...